Movatterモバイル変換


[0]ホーム

URL:


cppreference.com
Namespaces
Variants
    Actions

      std::log10(std::complex)

      From cppreference.com
      <cpp‎ |numeric‎ |complex
       
       
       
       
      Defined in header<complex>
      template<class T>
      std::complex<T> log10(conststd::complex<T>& z);

      Computes complex common (base10) logarithm of a complex valuez with a branch cut along the negative real axis.

      The behavior of this function is equivalent tostd::log(z) /std::log(T(10)).

      Contents

      [edit]Parameters

      z - complex value

      [edit]Return value

      Complex common logarithm ofz.

      [edit]Example

      Run this code
      #include <cmath>#include <complex>#include <iostream> int main(){std::complex<double> z(0.0,1.0);// r = 0, θ = pi / 2std::cout<<"2 * log10"<< z<<" = "<<2.0*std::log10(z)<<'\n'; std::complex<double> z2(sqrt(2.0)/2, sqrt(2.0)/2);// r = 1, θ = pi / 4std::cout<<"4 * log10"<< z2<<" = "<<4.0*std::log10(z2)<<'\n'; std::complex<double> z3(-100.0,0.0);// r = 100, θ = pistd::cout<<"log10"<< z3<<" = "<<std::log10(z3)<<'\n';std::complex<double> z4(-100.0,-0.0);// the other side of the cutstd::cout<<"log10"<< z4<<" = "<<std::log10(z4)<<" ""(the other side of the cut)\n""(note: pi / log(10) = "<<std::acos(-1.0)/std::log(10.0)<<")\n";}

      Possible output:

      2 * log10(0,1) = (0,1.36438)4 * log10(0.707107,0.707107) = (0,1.36438)log10(-100,0) = (2,1.36438)log10(-100,-0) = (2,-1.36438) (the other side of the cut)(note: pi / log(10) = 1.36438)

      [edit]See also

      complex natural logarithm with the branch cuts along the negative real axis
      (function template)[edit]
      (C++11)(C++11)
      computes common (base10) logarithm (\({\small\log_{10}{x}}\)log10(x))
      (function)[edit]
      applies the functionstd::log10 to each element of valarray
      (function template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/complex/log10&oldid=150852"

      [8]ページ先頭

      ©2009-2025 Movatter.jp